Hydrogen-gas sensors based on graphene functionalized palladium nanoparticles: impedance response as a valuable sensor

2015 ◽  
Vol 39 (10) ◽  
pp. 8044-8054 ◽  
Author(s):  
Reinaldo David Martínez-Orozco ◽  
René Antaño-López ◽  
Vicente Rodríguez-González
Keyword(s):  
Gas Sensors ◽  
Palladium Nanoparticles ◽  
Hydrogen Gas ◽  
Gas Detection ◽  
Impedance Response ◽  
Active Layers ◽  
Hydrogen Gas Sensors ◽  
Hydrogen Gas Detection ◽  
Graphene Nanostructures

Palladium–graphene nanostructures were synthesized by the hydrothermal-microwave exfoliation method and employed as active layers for hydrogen gas detection.

scholarly journals ppb-Level Selective Hydrogen Gas Detection of Pd-Functionalized In2O3-Loaded ZnO Nanofiber Gas Sensors

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4276 ◽  
Author(s):  
Jae-Hyoung Lee ◽  
Jae-Hun Kim ◽  
Jin-Young Kim ◽  
Ali Mirzaei ◽  
Hyoun Woo Kim ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Hydrogen Gas ◽  
Strong Response ◽  
Pd Nanoparticle ◽  
Highly Sensitive ◽  
Hydrogen Gas Sensors ◽  
Zno Nanofibers ◽  
Gas Response ◽  
Hydrogen Gas Detection

Pd nanoparticle-functionalized, xIn2O3 (x = 0.05, 0.1, and 0.15)-loaded ZnO nanofibers were synthesized by an electrospinning and ultraviolet (UV) irradiation method and assessed for their hydrogen gas sensing properties. Morphological and chemical analyses revealed the desired morphology and chemical composition of the synthesized nanofibers. The optimal gas sensor namely Pd-functionalized, 0.1In2O3-loaded ZnO nanofibers showed a very strong response to 172–50 ppb hydrogen gas at 350 °C, which is regarded as the optimal sensing temperature. Furthermore, the gas sensors showed excellent selectivity to hydrogen gas due to the much lower response to CO and NO2 gases. The enhanced gas response was attributed to the excellent catalytic activity of Pd to hydrogen gas, and the formation of Pd/ZnO and In2O3/ZnO heterojunctions, ZnO–ZnO homojunction, as well as the formation of PdHx. Overall, highly sensitive and selective hydrogen gas sensors can be produced based on a simple methodology using a synergistic effect from Pd functionalization and In2O3 loading in ZnO nanofibers.

Pt/GaN Schottky diodes for hydrogen gas sensors

2006 ◽  
Vol 113 (2) ◽  
pp. 797-804 ◽  
Author(s):  
M. Ali ◽  
V. Cimalla ◽  
V. Lebedev ◽  
H. Romanus ◽  
V. Tilak ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Schottky Diodes ◽  
Hydrogen Gas ◽  
Hydrogen Gas Sensors

scholarly journals Hydrogen Gas Sensors Fabricated on Atomically Flat 4H-SiC Webbed Cantilevers

2008 ◽  
Vol 600-603 ◽  
pp. 1199-1202 ◽  
Author(s):  
Philip G. Neudeck ◽  
David J. Spry ◽  
Andrew J. Trunek ◽  
Laura J. Evans ◽  
Liang Yu Chen ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Rapid Detection ◽  
Hydrogen Gas ◽  
Current Gain ◽  
Proper Selection ◽  
Hydrogen Gas Sensors ◽  
Sensor Current ◽  
Atomically Flat ◽  
Initial Results ◽  
Selection Of

This paper reports on initial results from the first device tested of a “second generation” Pt-SiC Schottky diode hydrogen gas sensor that: 1) resides on the top of atomically flat 4H-SiC webbed cantilevers, 2) has integrated heater resistor, and 3) is bonded and packaged. With proper selection of heater resistor and sensor diode biases, rapid detection of H2 down to concentrations of 20 ppm was achieved. A stable sensor current gain of 125 ± 11 standard deviation was demonstrated during 250 hours of cyclic test exposures to 0.5% H2 and N2/air.

High performance and negative temperature coefficient of low temperature hydrogen gas sensors using palladium decorated tungsten oxide

2015 ◽  
Vol 3 (3) ◽  
pp. 1317-1324 ◽  
Author(s):  
Yanrong Wang ◽  
Bin Liu ◽  
Songhua Xiao ◽  
Han Li ◽  
Lingling Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Coefficient ◽  
Gas Sensors ◽  
High Performance ◽  
Negative Temperature Coefficient ◽  
Solvothermal Method ◽  
Negative Temperature ◽  
Hydrogen Sensor ◽  
Hydrogen Gas ◽  
Hydrogen Gas Sensors

A catalytically activated hydrogen sensor is obtained based on Pd decorated WO3 nanoplates constructed by a solvothermal method.

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